lib/sqlite/sqlite3.c

44788   i16 readLock;              /* Which read lock is being held.  -1 for none */
45650   pRet->readLock = -1;
46373 ** WAL_READ_LOCK(pWal->readLock).  The pWal->readLock integer is
46374 ** in the range 0 <= pWal->readLock < WAL_NREADER.  If pWal->readLock==(-1)
46377 ** including frame number aReadMark[pWal->readLock].  The reader will
46378 ** use WAL frames up to and including pWal->hdr.mxFrame if pWal->readLock>0
46379 ** Or if pWal->readLock==0, then the reader will ignore the WAL
46382 ** this routine will always set pWal->readLock>0 on success.
46384 ** lock on WAL_READ_LOCK(pWal->readLock) and set pWal->readLock to -1.
46400   assert( pWal->readLock<0 );     /* Not currently locked */
46486       pWal->readLock = 0;
46562       pWal->readLock = (i16)mxI;
46602   if( pWal->readLock>=0 ){
46603     walUnlockShared(pWal, WAL_READ_LOCK(pWal->readLock));
46604     pWal->readLock = -1;
46628   assert( pWal->readLock>=0 || pWal->lockError );
46632   ** in this case as an optimization.  Likewise, if pWal->readLock==0,
46636   if( iLast==0 || pWal->readLock==0 ){
46733   if( pWal && ALWAYS(pWal->readLock>=0) ){
46758   assert( pWal->readLock>=0 );
46906   if( pWal->readLock==0 ){
46958     pWal->readLock = -1;
47257 ** on the pWal->readLock byte.  If the WAL is already in locking_mode=NORMAL
47264 ** locking_mode=EXCLUSIVE.  This means that the pWal->readLock must
47280   /* pWal->readLock is usually set, but might be -1 if there was a
47286   assert( pWal->readLock>=0 || pWal->lockError );
47287   assert( pWal->readLock>=0 || (op<=0 && pWal->exclusiveMode==0) );
47292       if( walLockShared(pWal, WAL_READ_LOCK(pWal->readLock))!=SQLITE_OK ){
47302     assert( pWal->readLock>=0 );
47303     walUnlockShared(pWal, WAL_READ_LOCK(pWal->readLock));